1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
|
/*
This file is part of TALER
Copyright (C) 2014, 2015 GNUnet e.V.
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU Affero General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
TALER is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License along with
TALER; see the file COPYING. If not, If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file taler-mint-httpd_responses.c
* @brief API for generating the various replies of the mint; these
* functions are called TMH_RESPONSE_reply_ and they generate
* and queue MHD response objects for a given connection.
* @author Florian Dold
* @author Benedikt Mueller
* @author Christian Grothoff
*/
#include "platform.h"
#include "taler-mint-httpd_responses.h"
#include "taler_util.h"
#include <gnunet/gnunet_util_lib.h>
#include "taler-mint-httpd_keystate.h"
/**
* Send JSON object as response.
*
* @param connection the MHD connection
* @param json the json object
* @param response_code the http response code
* @return MHD result code
*/
int
TMH_RESPONSE_reply_json (struct MHD_Connection *connection,
const json_t *json,
unsigned int response_code)
{
struct MHD_Response *resp;
char *json_str;
int ret;
json_str = json_dumps (json, JSON_INDENT(2));
GNUNET_assert (NULL != json_str);
resp = MHD_create_response_from_buffer (strlen (json_str), json_str,
MHD_RESPMEM_MUST_FREE);
if (NULL == resp)
{
free (json_str);
GNUNET_break (0);
return MHD_NO;
}
(void) MHD_add_response_header (resp,
MHD_HTTP_HEADER_CONTENT_TYPE,
"application/json");
ret = MHD_queue_response (connection,
response_code,
resp);
MHD_destroy_response (resp);
return ret;
}
/**
* Function to call to handle the request by building a JSON
* reply from a format string and varargs.
*
* @param connection the MHD connection to handle
* @param response_code HTTP response code to use
* @param fmt format string for pack
* @param ... varargs
* @return MHD result code
*/
int
TMH_RESPONSE_reply_json_pack (struct MHD_Connection *connection,
unsigned int response_code,
const char *fmt,
...)
{
json_t *json;
va_list argp;
int ret;
json_error_t jerror;
va_start (argp, fmt);
json = json_vpack_ex (&jerror, 0, fmt, argp);
va_end (argp);
if (NULL == json)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Failed to pack JSON with format `%s': %s\n",
fmt,
jerror.text);
GNUNET_break (0);
return MHD_NO;
}
ret = TMH_RESPONSE_reply_json (connection,
json,
response_code);
json_decref (json);
return ret;
}
/**
* Send a response indicating an invalid argument.
*
* @param connection the MHD connection to use
* @param param_name the parameter that is invalid
* @return a MHD result code
*/
int
TMH_RESPONSE_reply_arg_invalid (struct MHD_Connection *connection,
const char *param_name)
{
return TMH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_BAD_REQUEST,
"{s:s, s:s}",
"error", "invalid parameter",
"parameter", param_name);
}
/**
* Send a response indicating an argument refering to a
* resource unknown to the mint (i.e. unknown reserve or
* denomination key).
*
* @param connection the MHD connection to use
* @param param_name the parameter that is invalid
* @return a MHD result code
*/
int
TMH_RESPONSE_reply_arg_unknown (struct MHD_Connection *connection,
const char *param_name)
{
return TMH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_NOT_FOUND,
"{s:s, s:s}",
"error", "unknown entity referenced",
"parameter", param_name);
}
/**
* Send a response indicating an invalid signature.
*
* @param connection the MHD connection to use
* @param param_name the parameter that is invalid
* @return a MHD result code
*/
int
TMH_RESPONSE_reply_signature_invalid (struct MHD_Connection *connection,
const char *param_name)
{
return TMH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_UNAUTHORIZED,
"{s:s, s:s}",
"error", "invalid signature",
"parameter", param_name);
}
/**
* Send a response indicating a missing argument.
*
* @param connection the MHD connection to use
* @param param_name the parameter that is missing
* @return a MHD result code
*/
int
TMH_RESPONSE_reply_arg_missing (struct MHD_Connection *connection,
const char *param_name)
{
return TMH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_BAD_REQUEST,
"{ s:s, s:s}",
"error", "missing parameter",
"parameter", param_name);
}
/**
* Send a response indicating permission denied.
*
* @param connection the MHD connection to use
* @param hint hint about why access was denied
* @return a MHD result code
*/
int
TMH_RESPONSE_reply_permission_denied (struct MHD_Connection *connection,
const char *hint)
{
return TMH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_FORBIDDEN,
"{s:s, s:s}",
"error", "permission denied",
"hint", hint);
}
/**
* Send a response indicating an internal error.
*
* @param connection the MHD connection to use
* @param hint hint about the internal error's nature
* @return a MHD result code
*/
int
TMH_RESPONSE_reply_internal_error (struct MHD_Connection *connection,
const char *hint)
{
return TMH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
"{s:s, s:s}",
"error", "internal error",
"hint", hint);
}
/**
* Send a response indicating an external error.
*
* @param connection the MHD connection to use
* @param hint hint about the error's nature
* @return a MHD result code
*/
int
TMH_RESPONSE_reply_external_error (struct MHD_Connection *connection,
const char *hint)
{
return TMH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_BAD_REQUEST,
"{s:s, s:s}",
"error", "client error",
"hint", hint);
}
/**
* Send a response indicating an error committing a
* transaction (concurrent interference).
*
* @param connection the MHD connection to use
* @return a MHD result code
*/
int
TMH_RESPONSE_reply_commit_error (struct MHD_Connection *connection)
{
return TMH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_BAD_REQUEST,
"{s:s}",
"error", "commit failure");
}
/**
* Send a response indicating a failure to talk to the Mint's
* database.
*
* @param connection the MHD connection to use
* @return a MHD result code
*/
int
TMH_RESPONSE_reply_internal_db_error (struct MHD_Connection *connection)
{
return TMH_RESPONSE_reply_internal_error (connection,
"Failed to connect to database");
}
/**
* Send a response indicating that the request was too big.
*
* @param connection the MHD connection to use
* @return a MHD result code
*/
int
TMH_RESPONSE_reply_request_too_large (struct MHD_Connection *connection)
{
struct MHD_Response *resp;
int ret;
resp = MHD_create_response_from_buffer (0,
NULL,
MHD_RESPMEM_PERSISTENT);
if (NULL == resp)
return MHD_NO;
ret = MHD_queue_response (connection,
MHD_HTTP_REQUEST_ENTITY_TOO_LARGE,
resp);
MHD_destroy_response (resp);
return ret;
}
/**
* Send a response indicating that the JSON was malformed.
*
* @param connection the MHD connection to use
* @return a MHD result code
*/
int
TMH_RESPONSE_reply_invalid_json (struct MHD_Connection *connection)
{
return TMH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_BAD_REQUEST,
"{s:s}",
"error",
"invalid json");
}
/**
* Send confirmation of deposit success to client. This function
* will create a signed message affirming the given information
* and return it to the client. By this, the mint affirms that
* the coin had sufficient (residual) value for the specified
* transaction and that it will execute the requested deposit
* operation with the given wiring details.
*
* @param connection connection to the client
* @param coin_pub public key of the coin
* @param h_wire hash of wire details
* @param h_contract hash of contract details
* @param transaction_id transaction ID
* @param timestamp client's timestamp
* @param refund_deadline until when this deposit be refunded
* @param merchant merchant public key
* @param amount_without_fee fraction of coin value to deposit, without the fee
* @return MHD result code
*/
int
TMH_RESPONSE_reply_deposit_success (struct MHD_Connection *connection,
const struct TALER_CoinSpendPublicKeyP *coin_pub,
const struct GNUNET_HashCode *h_wire,
const struct GNUNET_HashCode *h_contract,
uint64_t transaction_id,
struct GNUNET_TIME_Absolute timestamp,
struct GNUNET_TIME_Absolute refund_deadline,
const struct TALER_MerchantPublicKeyP *merchant,
const struct TALER_Amount *amount_without_fee)
{
struct TALER_DepositConfirmationPS dc;
struct TALER_MintPublicKeyP pub;
struct TALER_MintSignatureP sig;
dc.purpose.purpose = htonl (TALER_SIGNATURE_MINT_CONFIRM_DEPOSIT);
dc.purpose.size = htonl (sizeof (struct TALER_DepositConfirmationPS));
dc.h_contract = *h_contract;
dc.h_wire = *h_wire;
dc.transaction_id = GNUNET_htonll (transaction_id);
dc.timestamp = GNUNET_TIME_absolute_hton (timestamp);
dc.refund_deadline = GNUNET_TIME_absolute_hton (refund_deadline);
TALER_amount_hton (&dc.amount_without_fee,
amount_without_fee);
dc.coin_pub = *coin_pub;
dc.merchant = *merchant;
TMH_KS_sign (&dc.purpose,
&pub,
&sig);
return TMH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_OK,
"{s:s, s:o, s:o}",
"status", "DEPOSIT_OK",
"sig", TALER_json_from_data (&sig,
sizeof (sig)),
"pub", TALER_json_from_data (&pub,
sizeof (pub)));
}
/**
* Compile the transaction history of a coin into a JSON object.
*
* @param tl transaction history to JSON-ify
* @return json representation of the @a rh
*/
static json_t *
compile_transaction_history (const struct TALER_MINTDB_TransactionList *tl)
{
json_t *transaction;
const char *type;
struct TALER_Amount value;
json_t *history;
const struct TALER_MINTDB_TransactionList *pos;
history = json_array ();
for (pos = tl; NULL != pos; pos = pos->next)
{
switch (pos->type)
{
case TALER_MINTDB_TT_DEPOSIT:
{
struct TALER_DepositRequestPS dr;
const struct TALER_MINTDB_Deposit *deposit = pos->details.deposit;
type = "deposit";
value = deposit->amount_with_fee;
dr.purpose.purpose = htonl (TALER_SIGNATURE_WALLET_COIN_DEPOSIT);
dr.purpose.size = htonl (sizeof (struct TALER_DepositRequestPS));
dr.h_contract = deposit->h_contract;
dr.h_wire = deposit->h_wire;
dr.timestamp = GNUNET_TIME_absolute_hton (deposit->timestamp);
dr.refund_deadline = GNUNET_TIME_absolute_hton (deposit->refund_deadline);
dr.transaction_id = GNUNET_htonll (deposit->transaction_id);
TALER_amount_hton (&dr.amount_with_fee,
&deposit->amount_with_fee);
TALER_amount_hton (&dr.deposit_fee,
&deposit->deposit_fee);
dr.merchant = deposit->merchant_pub;
dr.coin_pub = deposit->coin.coin_pub;
/* internal sanity check before we hand out a bogus sig... */
if (GNUNET_OK !=
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_WALLET_COIN_DEPOSIT,
&dr.purpose,
&deposit->csig.eddsa_signature,
&deposit->coin.coin_pub.eddsa_pub))
{
GNUNET_break (0);
json_decref (history);
return NULL;
}
transaction = TALER_json_from_eddsa_sig (&dr.purpose,
&deposit->csig.eddsa_signature);
break;
}
case TALER_MINTDB_TT_REFRESH_MELT:
{
struct TALER_RefreshMeltCoinAffirmationPS ms;
const struct TALER_MINTDB_RefreshMelt *melt = pos->details.melt;
type = "melt";
value = melt->amount_with_fee;
ms.purpose.purpose = htonl (TALER_SIGNATURE_WALLET_COIN_MELT);
ms.purpose.size = htonl (sizeof (struct TALER_RefreshMeltCoinAffirmationPS));
ms.session_hash = melt->session_hash;
TALER_amount_hton (&ms.amount_with_fee,
&melt->amount_with_fee);
TALER_amount_hton (&ms.melt_fee,
&melt->melt_fee);
ms.coin_pub = melt->coin.coin_pub;
/* internal sanity check before we hand out a bogus sig... */
if (GNUNET_OK !=
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_WALLET_COIN_MELT,
&ms.purpose,
&melt->coin_sig.eddsa_signature,
&melt->coin.coin_pub.eddsa_pub))
{
GNUNET_break (0);
json_decref (history);
return NULL;
}
transaction = TALER_json_from_eddsa_sig (&ms.purpose,
&melt->coin_sig.eddsa_signature);
}
break;
default:
GNUNET_assert (0);
}
json_array_append_new (history,
json_pack ("{s:s, s:o, s:o}",
"type", type,
"amount", TALER_json_from_amount (&value),
"signature", transaction));
}
return history;
}
/**
* Send proof that a /deposit request is invalid to client. This
* function will create a message with all of the operations affecting
* the coin that demonstrate that the coin has insufficient value.
*
* @param connection connection to the client
* @param tl transaction list to use to build reply
* @return MHD result code
*/
int
TMH_RESPONSE_reply_deposit_insufficient_funds (struct MHD_Connection *connection,
const struct TALER_MINTDB_TransactionList *tl)
{
json_t *history;
history = compile_transaction_history (tl);
if (NULL == history)
return TMH_RESPONSE_reply_internal_db_error (connection);
return TMH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_FORBIDDEN,
"{s:s, s:o}",
"error", "insufficient funds",
"history", history);
}
/**
* Compile the history of a reserve into a JSON object
* and calculate the total balance.
*
* @param rh reserve history to JSON-ify
* @param[out] balance set to current reserve balance
* @return json representation of the @a rh, NULL on error
*/
static json_t *
compile_reserve_history (const struct TALER_MINTDB_ReserveHistory *rh,
struct TALER_Amount *balance)
{
struct TALER_Amount deposit_total;
struct TALER_Amount withdraw_total;
struct TALER_Amount value;
json_t *json_history;
json_t *transaction;
int ret;
const struct TALER_MINTDB_ReserveHistory *pos;
struct TALER_WithdrawRequestPS wr;
json_history = json_array ();
ret = 0;
for (pos = rh; NULL != pos; pos = pos->next)
{
switch (pos->type)
{
case TALER_MINTDB_RO_BANK_TO_MINT:
if (0 == ret)
deposit_total = pos->details.bank->amount;
else
if (GNUNET_OK !=
TALER_amount_add (&deposit_total,
&deposit_total,
&pos->details.bank->amount))
{
json_decref (json_history);
return NULL;
}
ret = 1;
json_array_append_new (json_history,
json_pack ("{s:s, s:O, s:o}",
"type", "DEPOSIT",
"wire", pos->details.bank->wire,
"amount", TALER_json_from_amount (&pos->details.bank->amount)));
break;
case TALER_MINTDB_RO_WITHDRAW_COIN:
break;
}
}
ret = 0;
for (pos = rh; NULL != pos; pos = pos->next)
{
switch (pos->type)
{
case TALER_MINTDB_RO_BANK_TO_MINT:
break;
case TALER_MINTDB_RO_WITHDRAW_COIN:
value = pos->details.withdraw->amount_with_fee;
if (0 == ret)
{
withdraw_total = value;
}
else
{
if (GNUNET_OK !=
TALER_amount_add (&withdraw_total,
&withdraw_total,
&value))
{
json_decref (json_history);
return NULL;
}
}
ret = 1;
wr.purpose.purpose = htonl (TALER_SIGNATURE_WALLET_RESERVE_WITHDRAW);
wr.purpose.size = htonl (sizeof (struct TALER_WithdrawRequestPS));
wr.reserve_pub = pos->details.withdraw->reserve_pub;
TALER_amount_hton (&wr.amount_with_fee,
&value);
TALER_amount_hton (&wr.withdraw_fee,
&pos->details.withdraw->withdraw_fee);
GNUNET_CRYPTO_rsa_public_key_hash (pos->details.withdraw->denom_pub.rsa_public_key,
&wr.h_denomination_pub);
wr.h_coin_envelope = pos->details.withdraw->h_coin_envelope;
transaction = TALER_json_from_eddsa_sig (&wr.purpose,
&pos->details.withdraw->reserve_sig.eddsa_signature);
json_array_append_new (json_history,
json_pack ("{s:s, s:o, s:o}",
"type", "WITHDRAW",
"signature", transaction,
"amount", TALER_json_from_amount (&value)));
break;
}
}
if (0 == ret)
{
/* did not encounter any withdraw operations, set to zero */
TALER_amount_get_zero (deposit_total.currency,
&withdraw_total);
}
if (GNUNET_SYSERR ==
TALER_amount_subtract (balance,
&deposit_total,
&withdraw_total))
{
GNUNET_break (0);
json_decref (json_history);
return NULL;
}
return json_history;
}
/**
* Send reserve status information to client.
*
* @param connection connection to the client
* @param rh reserve history to return
* @return MHD result code
*/
int
TMH_RESPONSE_reply_withdraw_status_success (struct MHD_Connection *connection,
const struct TALER_MINTDB_ReserveHistory *rh)
{
json_t *json_balance;
json_t *json_history;
struct TALER_Amount balance;
json_history = compile_reserve_history (rh,
&balance);
if (NULL == json_history)
return TMH_RESPONSE_reply_internal_error (connection,
"balance calculation failure");
json_balance = TALER_json_from_amount (&balance);
return TMH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_OK,
"{s:o, s:o}",
"balance", json_balance,
"history", json_history);
}
/**
* Send reserve status information to client with the
* message that we have insufficient funds for the
* requested /withdraw/sign operation.
*
* @param connection connection to the client
* @param rh reserve history to return
* @return MHD result code
*/
int
TMH_RESPONSE_reply_withdraw_sign_insufficient_funds (struct MHD_Connection *connection,
const struct TALER_MINTDB_ReserveHistory *rh)
{
json_t *json_balance;
json_t *json_history;
struct TALER_Amount balance;
json_history = compile_reserve_history (rh,
&balance);
if (NULL == json_history)
return TMH_RESPONSE_reply_internal_error (connection,
"balance calculation failure");
json_balance = TALER_json_from_amount (&balance);
return TMH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_PAYMENT_REQUIRED,
"{s:s, s:o, s:o}",
"error", "Insufficient funds",
"balance", json_balance,
"history", json_history);
}
/**
* Send blinded coin information to client.
*
* @param connection connection to the client
* @param collectable blinded coin to return
* @return MHD result code
*/
int
TMH_RESPONSE_reply_withdraw_sign_success (struct MHD_Connection *connection,
const struct TALER_MINTDB_CollectableBlindcoin *collectable)
{
json_t *sig_json;
sig_json = TALER_json_from_rsa_signature (collectable->sig.rsa_signature);
return TMH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_OK,
"{s:o}",
"ev_sig", sig_json);
}
/**
* Send a response for a failed "/refresh/melt" request. The
* transaction history of the given coin demonstrates that the
* @a residual value of the coin is below the @a requested
* contribution of the coin for the melt. Thus, the mint
* refuses the melt operation.
*
* @param connection the connection to send the response to
* @param coin_pub public key of the coin
* @param coin_value original value of the coin
* @param tl transaction history for the coin
* @param requested how much this coin was supposed to contribute, including fee
* @param residual remaining value of the coin (after subtracting @a tl)
* @return a MHD result code
*/
int
TMH_RESPONSE_reply_refresh_melt_insufficient_funds (struct MHD_Connection *connection,
const struct TALER_CoinSpendPublicKeyP *coin_pub,
struct TALER_Amount coin_value,
struct TALER_MINTDB_TransactionList *tl,
struct TALER_Amount requested,
struct TALER_Amount residual)
{
json_t *history;
history = compile_transaction_history (tl);
if (NULL == history)
return TMH_RESPONSE_reply_internal_db_error (connection);
return TMH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_FORBIDDEN,
"{s:s, s:o, s:o, s:o, s:o, s:o}",
"error",
"insufficient funds",
"coin_pub",
TALER_json_from_data (coin_pub,
sizeof (struct TALER_CoinSpendPublicKeyP)),
"original_value",
TALER_json_from_amount (&coin_value),
"residual_value",
TALER_json_from_amount (&residual),
"requested_value",
TALER_json_from_amount (&requested),
"history",
history);
}
/**
* Send a response to a "/refresh/melt" request.
*
* @param connection the connection to send the response to
* @param session_hash hash of the refresh session
* @param noreveal_index which index will the client not have to reveal
* @return a MHD status code
*/
int
TMH_RESPONSE_reply_refresh_melt_success (struct MHD_Connection *connection,
const struct GNUNET_HashCode *session_hash,
uint16_t noreveal_index)
{
struct TALER_RefreshMeltConfirmationPS body;
struct TALER_MintPublicKeyP pub;
struct TALER_MintSignatureP sig;
json_t *sig_json;
body.purpose.size = htonl (sizeof (struct TALER_RefreshMeltConfirmationPS));
body.purpose.purpose = htonl (TALER_SIGNATURE_MINT_CONFIRM_MELT);
body.session_hash = *session_hash;
body.noreveal_index = htons (noreveal_index);
body.reserved = htons (0);
TMH_KS_sign (&body.purpose,
&pub,
&sig);
sig_json = TALER_json_from_data (&sig,
sizeof (sig));
GNUNET_assert (NULL != sig_json);
return TMH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_OK,
"{s:i, s:o, s:o}",
"noreveal_index", (int) noreveal_index,
"mint_sig", sig_json,
"mint_pub", TALER_json_from_data (&pub,
sizeof (pub)));
}
/**
* Send a response for "/refresh/reveal".
*
* @param connection the connection to send the response to
* @param num_newcoins number of new coins for which we reveal data
* @param sigs array of @a num_newcoins signatures revealed
* @return a MHD result code
*/
int
TMH_RESPONSE_reply_refresh_reveal_success (struct MHD_Connection *connection,
unsigned int num_newcoins,
const struct TALER_DenominationSignature *sigs)
{
int newcoin_index;
json_t *root;
json_t *obj;
json_t *list;
int ret;
list = json_array ();
for (newcoin_index = 0; newcoin_index < num_newcoins; newcoin_index++)
{
obj = json_object ();
json_object_set_new (obj,
"ev_sig",
TALER_json_from_rsa_signature (sigs[newcoin_index].rsa_signature));
json_array_append_new (list,
obj);
}
root = json_object ();
json_object_set_new (root,
"ev_sigs",
list);
ret = TMH_RESPONSE_reply_json (connection,
root,
MHD_HTTP_OK);
json_decref (root);
return ret;
}
/**
* Send a response for a failed "/refresh/reveal", where the
* revealed value(s) do not match the original commitment.
*
* @param connection the connection to send the response to
* @param mc all information about the original commitment
* @param off offset in the array of kappa-commitments where
* the missmatch was detected
* @param j index of the coin for which the missmatch was
* detected
* @param missmatch_object name of the object that was
* bogus (i.e. "transfer key").
* @return a MHD result code
*/
int
TMH_RESPONSE_reply_refresh_reveal_missmatch (struct MHD_Connection *connection,
const struct TALER_MINTDB_MeltCommitment *mc,
unsigned int off,
unsigned int j,
const char *missmatch_object)
{
json_t *info_old;
json_t *info_new;
json_t *info_commit;
json_t *info_links;
unsigned int i;
unsigned int k;
info_old = json_array ();
for (i=0;i<mc->num_oldcoins;i++)
{
const struct TALER_MINTDB_RefreshMelt *rm;
json_t *rm_json;
rm = &mc->melts[i];
rm_json = json_object ();
json_object_set_new (rm_json,
"coin_sig",
TALER_json_from_data (&rm->coin_sig,
sizeof (struct TALER_CoinSpendSignatureP)));
json_object_set_new (rm_json,
"coin_pub",
TALER_json_from_data (&rm->coin.coin_pub,
sizeof (struct TALER_CoinSpendPublicKeyP)));
json_object_set_new (rm_json,
"melt_amount_with_fee",
TALER_json_from_amount (&rm->amount_with_fee));
json_object_set_new (rm_json,
"melt_fee",
TALER_json_from_amount (&rm->melt_fee));
json_array_append_new (info_old,
rm_json);
}
info_new = json_array ();
for (i=0;i<mc->num_newcoins;i++)
{
const struct TALER_DenominationPublicKey *pk;
pk = &mc->denom_pubs[i];
json_array_append_new (info_new,
TALER_json_from_rsa_public_key (pk->rsa_public_key));
}
info_commit = json_array ();
info_links = json_array ();
for (k=0;k<TALER_CNC_KAPPA;k++)
{
json_t *info_commit_k;
json_t *info_link_k;
info_commit_k = json_array ();
for (i=0;i<mc->num_newcoins;i++)
{
const struct TALER_MINTDB_RefreshCommitCoin *cc;
json_t *cc_json;
cc = &mc->commit_coins[k][i];
cc_json = json_object ();
json_object_set_new (cc_json,
"coin_ev",
TALER_json_from_data (cc->coin_ev,
cc->coin_ev_size));
json_object_set_new (cc_json,
"coin_priv_enc",
TALER_json_from_data (cc->refresh_link->coin_priv_enc,
sizeof (struct TALER_CoinSpendPrivateKeyP)));
json_object_set_new (cc_json,
"blinding_key_enc",
TALER_json_from_data (cc->refresh_link->blinding_key_enc,
cc->refresh_link->blinding_key_enc_size));
json_array_append_new (info_commit_k,
cc_json);
}
json_array_append_new (info_commit,
info_commit_k);
info_link_k = json_array ();
for (i=0;i<mc->num_newcoins;i++)
{
const struct TALER_RefreshCommitLinkP *cl;
json_t *cl_json;
cl = &mc->commit_links[k][i];
cl_json = json_object ();
json_object_set_new (cl_json,
"transfer_pub",
TALER_json_from_data (&cl->transfer_pub,
sizeof (struct TALER_TransferPublicKeyP)));
json_object_set_new (cl_json,
"shared_secret_enc",
TALER_json_from_data (&cl->shared_secret_enc,
sizeof (struct TALER_EncryptedLinkSecretP)));
json_array_append_new (info_link_k,
cl_json);
}
json_array_append_new (info_links,
info_link_k);
}
return TMH_RESPONSE_reply_json_pack (connection,
MHD_HTTP_CONFLICT,
"{s:s, s:i, s:i, s:o, s:o, s:o, s:o, s:s}",
"error", "commitment violation",
"offset", (int) off,
"index", (int) j,
"oldcoin_infos", info_old,
"newcoin_infos", info_new,
"commit_infos", info_commit,
"link_infos", info_links,
"object", missmatch_object);
}
/**
* Send a response for "/refresh/link".
*
* @param connection the connection to send the response to
* @param num_sessions number of sessions the coin was used in
* @param sessions array of @a num_session entries with
* information for each session
* @return a MHD result code
*/
int
TMH_RESPONSE_reply_refresh_link_success (struct MHD_Connection *connection,
unsigned int num_sessions,
const struct TMH_RESPONSE_LinkSessionInfo *sessions)
{
json_t *root;
json_t *mlist;
int res;
unsigned int i;
mlist = json_array ();
for (i=0;i<num_sessions;i++)
{
const struct TALER_MINTDB_LinkDataList *pos;
json_t *list = json_array ();
for (pos = sessions[i].ldl; NULL != pos; pos = pos->next)
{
json_t *obj;
obj = json_object ();
json_object_set_new (obj,
"link_enc",
TALER_json_from_data (pos->link_data_enc->coin_priv_enc,
sizeof (struct TALER_CoinSpendPrivateKeyP) +
pos->link_data_enc->blinding_key_enc_size));
json_object_set_new (obj,
"denom_pub",
TALER_json_from_rsa_public_key (pos->denom_pub.rsa_public_key));
json_object_set_new (obj,
"ev_sig",
TALER_json_from_rsa_signature (pos->ev_sig.rsa_signature));
json_array_append_new (list,
obj);
}
root = json_object ();
json_object_set_new (root,
"new_coins",
list);
json_object_set_new (root,
"transfer_pub",
TALER_json_from_data (&sessions[i].transfer_pub,
sizeof (struct TALER_TransferPublicKeyP)));
json_object_set_new (root,
"secret_enc",
TALER_json_from_data (&sessions[i].shared_secret_enc,
sizeof (struct TALER_EncryptedLinkSecretP)));
json_array_append_new (mlist,
root);
}
res = TMH_RESPONSE_reply_json (connection,
mlist,
MHD_HTTP_OK);
json_decref (mlist);
return res;
}
/* end of taler-mint-httpd_responses.c */
|